пухлая как пышка

She was as timid as a partridge, and, he told himself greedily, as smooth and plump. (A. J. Cronin, ‘Hatter's Castle’, book II, ch. 9) — Девушка была боязлива, как вспугнутая куропатка, и - сказал себе Мэт, облизываясь, - такая же жирненькая и мягкая.

...Marjorie Stafford was as fair as the morning, with bright-red cheeks, bluish-gray eyes, and flaxen hair, and as plump as a partridge. (Th. Dreiser, ‘The Financier’, ch. III) —...Марджори Стаффорд - белокурая пышка с голубовато-серыми глазами, румяная и свежая, как утренняя заря.